trpl-zh-cn/listings/ch05-using-structs-to-structure-related-data/no-listing-02-reference-in-struct/src/main.rs

struct User {
    active: bool,
    username: &str,
    email: &str,
    sign_in_count: u64,
}

fn main() {
    let user1 = User {
        email: "someone@example.com",
        username: "someusername123",
        active: true,
        sign_in_count: 1,
    };
}